SCR Rain or Leak Alarm (CB22097E)

This sensitive circuit was found in old documentation. The SCR can be any of the 106 series and the transistor a BC548.

Voltmeter LM4250 (CB14177E)
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
4-Channel Remote Control Transmitter (CB20472E)
This tone-modulated transmitter was found in recent English documentation. The circuit operates in the 27...
ICL7660 Positive Voltage Multiplier (CB25848E)
This very low current circuit was found in the April 1995 issue of Electronics Now magazine. The...